Initial community commit

Src/replicant/nsmp3dec/huffmandecoder.h

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+/***************************************************************************\
+ *
+*                    MPEG Layer3-Audio Decoder
+*                  <20> 1997-2006 by Fraunhofer IIS
+ *                        All Rights Reserved
+ *
+ *   filename: huffmandecoder.h
+ *   project : MPEG Decoder
+ *   author  : Martin Sieler
+ *   date    : 1998-02-08
+ *   contents/description: HEADER - huffman decoder
+ *
+ *
+\***************************************************************************/
+
+/*
+ * $Date: 2011/01/21 22:25:58 $
+ * $Id: huffmandecoder.h,v 1.4 2011/01/21 22:25:58 audiodsp Exp $
+ */
+
+#ifndef __HUFFMANDECODER_H__
+#define __HUFFMANDECODER_H__
+
+/* ------------------------ includes --------------------------------------*/
+
+#include "bitsequence.h"
+#include "huffmanbitobj.h"
+#include "huffmantable.h"
+
+/*-------------------------- defines --------------------------------------*/
+
+class CBitStream;
+
+/*-------------------------------------------------------------------------*/
+
+//
+// Huffman decoder (helper) class.
+//
+//  This object reads and decodes MPEG Layer-3 huffman data.
+//
+
+class CHuffmanDecoder
+{
+public:
+  CHuffmanDecoder();
+  virtual ~CHuffmanDecoder();
+
+  int ReadHuffmanCode(CBitStream &Bs,
+                      int        *pIsp,
+                      const int  *pTableSelect,
+                      const int  *pRegionEnd,
+                      int         Count1TableSelect,
+                      int         Part2_3Length);
+
+protected:
+
+private:
+  int  ReadBigValues(CBitStream  &Bs,
+                     int         *pIsp,
+                     const int   *pTableSelect,
+                     const int   *pRegionEnd);
+
+  int  ReadCount1Area(CBitStream &Bs,
+                      int        *pIsp,
+                      int         Count1TableSelect,
+                      int         Count1Start,
+                      int         Part2_3Length);
+#ifdef _MSC_VER
+	// these only have one caller and inlining shows notable improvements in the profiler
+  __forceinline void ReadHuffmanDual   (CBitStream &Bs, int *pIsp);
+  __forceinline void ReadHuffmanDualLin(CBitStream &Bs, int *pIsp);
+  __forceinline bool ReadHuffmanQuad   (CBitStream &Bs, int *pIsp);
+#else
+	void ReadHuffmanDual   (CBitStream &Bs, int *pIsp);
+  void ReadHuffmanDualLin(CBitStream &Bs, int *pIsp);
+  bool ReadHuffmanQuad   (CBitStream &Bs, int *pIsp);
+#endif
+
+  CHuffmanTable  m_HuffmanTable;
+  CHuffmanBitObj m_HuffmanBitObj;
+  CBitSequence   m_LinBits;
+};
+
+/*-------------------------------------------------------------------------*/
+#endif